Study on conductivity and redox stability of iron orthovanadate

Peter I. Cowin; Rong Lan; Lei Zhang; C. T G Petit; Arno Kraft; Shanwen Tao

doi:10.1016/j.matchemphys.2011.01.009

Study on conductivity and redox stability of iron orthovanadate

Peter I. Cowin, Rong Lan, Lei Zhang, C. T G Petit, Arno Kraft, Shanwen Tao

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

FeVO₄ was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO₄ and Ag, forming a-AgVO ₃ and a-Fe₂O₃ at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO₄ exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H ₂/Ar, high electronic conductivity, from 1 S cm^-1 at 300 °C to 2 S cm^-1 at 700 °C, was observed with an activation energy of 0.13(1) eV. X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry data determined that the change in electronic conductivity was due to the degradation of the material into FeV ₂O₄ and a-Fe₂O₃. It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO₄ nor FeV₂O₄ are deemed suitable as anode materials for solid oxide fuel cells, due to redox instability. © 2010 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	614-618
Number of pages	5
Journal	Materials Chemistry and Physics
Volume	126
Issue number	3
DOIs	https://doi.org/10.1016/j.matchemphys.2011.01.009
Publication status	Published - 15 Apr 2011

Keywords

Ceramics
Electronic materials
Inorganic compounds
Oxide
Powder diffraction

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10.1016/j.matchemphys.2011.01.009

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@article{7adba8e03e834da18f7b700dbd63f244,

title = "Study on conductivity and redox stability of iron orthovanadate",

abstract = "FeVO4 was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO4 and Ag, forming a-AgVO 3 and a-Fe2O3 at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO4 exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H 2/Ar, high electronic conductivity, from 1 S cm-1 at 300 °C to 2 S cm-1 at 700 °C, was observed with an activation energy of 0.13(1) eV. X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry data determined that the change in electronic conductivity was due to the degradation of the material into FeV 2O4 and a-Fe2O3. It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO4 nor FeV2O4 are deemed suitable as anode materials for solid oxide fuel cells, due to redox instability. {\textcopyright} 2010 Elsevier B.V. All rights reserved.",

keywords = "Ceramics, Electronic materials, Inorganic compounds, Oxide, Powder diffraction",

author = "Cowin, {Peter I.} and Rong Lan and Lei Zhang and Petit, {C. T G} and Arno Kraft and Shanwen Tao",

year = "2011",

month = apr,

day = "15",

doi = "10.1016/j.matchemphys.2011.01.009",

language = "English",

volume = "126",

pages = "614--618",

journal = "Materials Chemistry and Physics",

issn = "0254-0584",

publisher = "Elsevier",

number = "3",

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TY - JOUR

T1 - Study on conductivity and redox stability of iron orthovanadate

AU - Cowin, Peter I.

AU - Lan, Rong

AU - Zhang, Lei

AU - Petit, C. T G

AU - Kraft, Arno

AU - Tao, Shanwen

PY - 2011/4/15

Y1 - 2011/4/15

N2 - FeVO4 was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO4 and Ag, forming a-AgVO 3 and a-Fe2O3 at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO4 exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H 2/Ar, high electronic conductivity, from 1 S cm-1 at 300 °C to 2 S cm-1 at 700 °C, was observed with an activation energy of 0.13(1) eV. X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry data determined that the change in electronic conductivity was due to the degradation of the material into FeV 2O4 and a-Fe2O3. It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO4 nor FeV2O4 are deemed suitable as anode materials for solid oxide fuel cells, due to redox instability. © 2010 Elsevier B.V. All rights reserved.

AB - FeVO4 was synthesised by conventional solid state technique. Impedance measurements using a silver electrode were unsuccessful due to a solid state reaction between FeVO4 and Ag, forming a-AgVO 3 and a-Fe2O3 at the interface. Impedance measurements, with a platinum electrode, reaffirmed that FeVO4 exhibits semiconductor behaviour in air. In a reducing atmosphere, 5% H 2/Ar, high electronic conductivity, from 1 S cm-1 at 300 °C to 2 S cm-1 at 700 °C, was observed with an activation energy of 0.13(1) eV. X-ray diffraction, thermogravimetric analysis and differential scanning calorimetry data determined that the change in electronic conductivity was due to the degradation of the material into FeV 2O4 and a-Fe2O3. It is believed that the conduction was due to electron hopping between vanadium d-orbitals. Neither FeVO4 nor FeV2O4 are deemed suitable as anode materials for solid oxide fuel cells, due to redox instability. © 2010 Elsevier B.V. All rights reserved.

KW - Ceramics

KW - Electronic materials

KW - Inorganic compounds

KW - Oxide

KW - Powder diffraction

U2 - 10.1016/j.matchemphys.2011.01.009

DO - 10.1016/j.matchemphys.2011.01.009

M3 - Article

SN - 0254-0584

VL - 126

SP - 614

EP - 618

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

IS - 3

ER -

Study on conductivity and redox stability of iron orthovanadate

Abstract

Keywords

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